diff --git a/platform/object-serializer/src/IonBindingProducer.kt b/platform/object-serializer/src/IonBindingProducer.kt
index 7fba8aa70347..78526db3c911 100644
--- a/platform/object-serializer/src/IonBindingProducer.kt
+++ b/platform/object-serializer/src/IonBindingProducer.kt
@@ -1,4 +1,4 @@
-// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.serialization
 
 import com.amazon.ion.Timestamp
@@ -72,10 +72,7 @@ internal class IonBindingProducer(override val propertyCollector: PropertyCollec
         PolymorphicBinding(aClass)
       }
       java.lang.Number::class.java.isAssignableFrom(aClass) -> IntNumberAsObjectBinding()
-      aClass is Proxy -> {
-        throw SerializationException("$aClass class is not supported")
-      }
-      aClass == Class::class.java -> {
+      aClass == Class::class.java || Proxy::class.java.isAssignableFrom(aClass) -> {
         // Class can be supported, but it will be implemented only when will be a real use case
         throw SerializationException("$aClass class is not supported")
       }